SixLabors Licensing and IronPDF
IronPDF depends on SixLabors NuGet packages, and SixLabors changed its licensing model across versions. You do not need to take any action to stay compliant; IronPDF already handles it.
SixLabors Commercial License
You do not need to separately comply with the SixLabors commercial license. The 3.x.x SixLabors versions that support later .NET releases carry a commercial license, but IronPDF already covers this on your behalf. No additional licensing action is required on your end.
License on .NET Framework
For the versions that support .NET Framework, SixLabors continues to use the Apache license.
Apache-Licensed Version Support
The 2.x.x Apache-licensed versions remain supported. SixLabors still makes bug-fix releases available for them.


Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.